50090 Datasheet, PDF (2/3 Pages) List of Unclassifed Manufacturers – PLT-22 POWER LINE TRANSCEIVER

Powered Or Unpowered Lines
The transceiver uses a low cost external coupling
circuit and can communicate over virtually any AC or DC power
mains, as well as unpowered twisted pair. The PLT-22
transceiver can use all of the same coupling circuits as
the PLT-21 transceiver.
Inexpensive Power Supply
The PLT-22 transceiver is powered by user-supplied
+8.5 to +16VDC and +5VDC power supplies. The wide power
supply range is a key benefit when designing inexpensive power
supplies. If a battery-backed power supply is used, the transceiv-
er will continue signaling even during a power failure on the
power mains.
The PLT-22 transceiver incorporates a power management
feature that constantly monitors the status of the node’s power
supply. If during transmission the power supply voltage falls
to a level that is insufficient to ensure reliable signaling, the
transceiver tells the Neuron^® Chip to stop transmitting until the
power supply voltage rises to an acceptable level. This allows the
use of a power supply with 1/3 the current capacity otherwise
required (100mA versus 300mA). The net result is a reduction in
the size, cost, and thermal dissipation of the power supply. Power
management is especially useful for high volume, low cost
consumer products such as electrical switches, outlets, and
dimmers.
PLT-22 Power Line Node Block Diagram
Crystal
EPROM
(3150)
Neuron
3120 or
3150
+5V
VA
Power
Supply
DSP
RX
Front
End
D/A
TX
AMP
(PLT-22 Transceiver shown in shaded area)
Coupling
Network
Line
Neutral/Earth
Flexible And Backward Compatible
Supplied as a miniature, uncoated Single In-Line Package
(SIP), the PLT-22 transceiver can be mounted on or inside an
OEM product, directly adjacent to the Neuron Chip with which
it is used. When connected to an external crystal, the transceiver
can supply either a 1.25, 2.5, 5, or 10MHz clock signal to the
Neuron Chip, eliminating the need for a separate Neuron Chip
crystal (note: Dual Carrier Frequency mode requires a 2.5MHz
or higher Neuron chip clock).
With pin-for-pin compatibility with the PLT-20 and PLT-21
transceivers, the PLT-22 transceiver can be used in existing
designs and networks. At the same time, the PLT-22 provides
smaller package dimensions to more easily fit tight enclosures.
For commercial and industrial applications in high rises,
manufacturing plants, utility substations, and other large
facilities, the PLT-22 transceiver can be used with Echelon’s
PLA-21 Power Line Amplifier. Capable of transmitting a 10V p-
p signal with 2A p-p current drive, the PLA-21 amplifier is ideal
for driving multiple phase coupling circuits, high attenuation
power circuits, and very low impedance loads near circuit break-
er panels and distribution transformers.
Helping You Succeed
To simplify the task of designing and commissioning
products using the PLT-22 transceiver, Echelon offers a
diagnostic tool, the PLCA-22 Power Line Communications
Analyzer, as well as a comprehensive range of development
tools, network interfaces, routers, and network services tools.
Technical support, design reviews and node verification for the
transceiver are all available through Echelon’s LonSupport^TM
technical assistance program.
NOTE: Solid lines are the PLT-22 outline; Dashed lines are the PLT-21 outline
PLT-22 Power Line Transceiver Dimensions